JPH0872759A - Preventing device for disengagement of crawler type traveling body - Google Patents

Abstract

PURPOSE: To prevent the track roller of a crawler type body from being disengaged from a track link. CONSTITUTION: The lower edge of a track frame 4 is extended downward closely opposed to the inner upper surface of a track shoe 8 over the lower edge position of a track roller 7 and a guide member 13 is provided oppositely to the lower edge part of the extended track frame 4 having a space toward the track shoe 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disengagement prevention device for a crawler type traveling body including a crawler (endless track body) of a hydraulic excavator, a tractor or the like.

[0002]

BACKGROUND OF THE INVENTION Generally,
In this type of crawler type traveling body, a track roller (idling rolling wheel) which is rotatably supported on the track frame side rolls on a track link protrudingly provided on the inner surface of the track shoe. By the way, a work vehicle equipped with such a crawler-type traveling body often travels in a wasteland, and in this case, stones or the like that have climbed on the inner upper surface of the track shoe move to the track link side, and the track roller, roller pin, etc. However, there is a problem that the member device is damaged and the track roller is promoted to be disengaged from the track link.

Therefore, the applicant of the present invention has filed in Japanese Patent Application No. 1-9
No. 8289 has been filed for utility model registration, but this one has a track guide 23 for axially supporting the track roller 22 in a state of hanging downward from the lower end edge of the track frame 21, as shown in FIG. Although it is integrally provided, a side plate 24 is further provided on the inner surface of the track guide 23.
It has been proposed that a guide member 26 is integrally provided on the lower end edge of the side plate 24 so as to closely face the track shoe 25 so as to prevent a stone or the like from riding up. Although this one has some effects such as preventing the track rollers from coming off, this one requires the side plate 24 to be provided separately and the side plate 24 is disposed inside the track guide 23. It is practically difficult to protect the track guide 23, and in particular, there is a risk that a stone or the like may be caught between the tapered outer surface of the track guide 23 and the track shoe 25. Is required.

[0004]

SUMMARY OF THE INVENTION The present invention has been conceived with the object of providing a device for preventing disengagement of a crawler type traveling body which can eliminate these drawbacks in view of the above situation. , The lower end edge of the track frame of the crawler type traveling body is extended downward beyond the lower end position of the track roller so as to cover the track roller inward and outward, and close to the track shoe, and at the lower end portion of the extended track frame. A guide member is integrally provided so as to face the track shoe with a gap.

According to the present invention, the track roller of the crawler type traveling body can be prevented from coming off the track link.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. In the drawings, 1 is a lower traveling body of a hydraulic excavator,
Reference numeral 2 denotes an upper revolving structure which is rotatably provided on the lower traveling structure 1, and 3 denotes a bucket equipped on the upper revolving structure 2. Of these, the present invention is carried out on the lower traveling structure 1. Will be described in detail. The undercarriage 1 is of a crawler type, and the track frame 4 is provided with an idler wheel 5 provided at a front end portion thereof, a drive sprocket 6 provided at a rear end portion thereof, and a collar portion 7a provided at upper and lower portions thereof. Track rollers (the present invention is directed to the lower track rollers, and henceforth, the lower track rollers will be simply referred to as “track rollers”) 7 are provided respectively, and the outer circumferences of these track rollers are surrounded. A crawler type track shoe 8 is wound around. On the other hand, the track frame 4 has a generally U-shaped cross section (in the embodiment, the upper surface has a generally triangular shape), and the bracket 1 is mounted on the inner side surface thereof via a support fitting 9.
0 is integrally provided, and in this bracket 10,
A roller pin 7a of the track roller 7 is supported.
Further, the track link 1 is provided on the inner peripheral surface of the track shoe 8.
1 is projected, and these adjacent track shoes 8
The track links 11 are flexibly connected by the track pins 12 to form an endless track body, and the drive sprocket 6 meshing with the track pins 12 drives forward and backward to move the vehicle forward and backward. It is supposed to be done.

The bottom edge of the track frame 4 is
Over substantially the entire length in the front-rear direction, the track roller 7 is extended from the left and right over the lower end position of the track roller 7 and downwardly in close proximity to the inner upper surface of the track shoe 8. The lower end edge of the track pin 12 faces the inner upper surface of the track shoe 8 with a gap therebetween.
A guide member 13 is integrally provided so as to project inward in the left-right direction so as to closely face and. Moreover, in this structure, the facing distance A between the guide member 13 and the track shoe 8 is the track link 11 of the roller collar portion 7a.
It is set so as to be smaller than the meshing allowance B with (A <B). As a result, as shown in FIG. When the guide member 13 comes into contact with the shoe 8, the roller collar portion 7a on the lifted side does not exceed the upper edge of the track link 11.

In the embodiment of the present invention constructed as described above, if there is a stone or the like that has climbed onto the inner upper surface of the track shoe 8 during work traveling, the stone or the like will fall downward while covering the track roller 7. The extension of the track frame 4 and the guide member 13 provided on the lower end edge of the extension prevent the track frame 4 from moving toward the track link 11. Moreover, in this case, since the extension portion of the track frame 4 is located outside the bracket 10 that pivotally supports the roller pin 7b and covers the bracket 10, a stone is not provided between the bracket 10 and the track shoe 8. It is also possible to effectively avoid biting of the like.

As described above, in the embodiment of the present invention, it is possible to effectively prevent stones or the like from entering the track link 11 side, but in that case, a side plate is separately required as in the conventional case. Instead, the track frame 4 which is a necessary member for forming the crawler type traveling body may be extended downward, and as a result, the side plate is not required as a separate member. In addition, it is possible to avoid an increase in the number of parts and to contribute to cost reduction without increasing the number of processing steps. In addition, since the track frame 4 only extends downward and the bracket 10 is also internally provided, the appearance is neat and clean compared to the conventional one in which these are exposed to the outside. It will be what you did.

Further, in this structure, the facing distance A between the guide member 13 and the track shoe 8 is smaller than the meshing allowance B between the roller collar portion 7a and the track link 11, and the track shoe 8 has a track frame. When one of the rollers 4 is inclined relatively and the guide member 13 comes into contact with the track shoe 8, the roller collar portion 7a on the lifted side.
Is set so as not to exceed the upper edge of the track link 11, the track roller 7
This is convenient because there is an advantage that it is possible to more effectively avoid accidentally deviating from 1.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and in forming the downward extension portion in the track frame, the present invention is not limited to the above-mentioned embodiment, and is substantially the entire length in the front-rear direction of the track frame. It may be formed in a substantially central portion in the front-rear direction as in the second embodiment shown in FIG. 4 without being formed over, and in this case, both front and rear edges of the guide member 14 are tapered, It is preferable to set the stones and the like that have been climbed up to be guided to the outside.

[0012]

In summary, since the present invention is constructed as described above, it is assumed that there is a stone or the like that has ridden on the inner upper surface of the track shoe during work traveling, and the stone or the like covers the track roller inside and outside. The extension of the track frame thus extended and the guide members provided at the lower end of the extension can prevent the track frame from entering the track roller side. Moreover, since the stones can be prevented from invading by extending the track frame instead of the side plate separately provided as in the conventional case, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator.

FIG. 2 is a vertical sectional view of a track frame portion.

FIG. 3 is a side view of a track frame portion.

FIG. 4 is a side view showing a second embodiment.

FIG. 5 is a lateral cross-sectional view showing a conventional example.

[Explanation of symbols]

 4 Track frame 7 Track roller 7a Collar 8 Track shoe 10 Bracket 11 Track link

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kunitomo Shimizu 4-10-1 Yoga, Setagaya-ku, Tokyo New Caterpillar Mitsubishi Corporation

Claims (6)

[Claims] 1. A track frame of a crawler-type traveling body is extended downwardly so as to cover the track roller inside and outside and beyond a track roller lower end position so as to closely face a track shoe and to extend the track frame. A disengagement prevention device for a crawler-type traveling body, characterized in that a guide member is integrally provided at the lower end of the so as to face the track shoe with a gap. 2. The track roller according to claim 1,
A crawler-type running body detachment prevention device, which is rotatably supported by a track frame. 3. The track roller according to claim 1,
A disengagement prevention device for a crawler-type traveling body, which is rotatably supported by a bracket integrally provided on an inner surface of a track frame. 4. The disengagement prevention device for a crawler-type traveling body according to claim 1, wherein the downward extension of the track frame is formed substantially at the center of the track frame in the front-rear direction. 5. The crawler-type traveling body detachment preventing device according to claim 1, wherein the downward extension of the track frame is formed over substantially the entire length of the track frame in the front-rear direction. 6. The crawler-type traveling body detachment preventing device according to claim 1, wherein the guide member is formed so as to project from a downward extension portion of the track frame toward a track link direction.